1 //===--- Token.h - Token interface ------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the Token interface.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_TOKEN_H
15 #define LLVM_CLANG_TOKEN_H
17 #include "clang/Basic/TemplateKinds.h"
18 #include "clang/Basic/TokenKinds.h"
19 #include "clang/Basic/SourceLocation.h"
20 #include "clang/Basic/OperatorKinds.h"
27 /// Token - This structure provides full information about a lexed token.
28 /// It is not intended to be space efficient, it is intended to return as much
29 /// information as possible about each returned token. This is expected to be
30 /// compressed into a smaller form if memory footprint is important.
32 /// The parser can create a special "annotation token" representing a stream of
33 /// tokens that were parsed and semantically resolved, e.g.: "foo::MyClass<int>"
34 /// can be represented by a single typename annotation token that carries
35 /// information about the SourceRange of the tokens and the type object.
37 /// The location of the token.
40 // Conceptually these next two fields could be in a union. However, this
41 // causes gcc 4.2 to pessimize LexTokenInternal, a very performance critical
42 // routine. Keeping as separate members with casts until a more beautiful fix
45 /// UintData - This holds either the length of the token text, when
46 /// a normal token, or the end of the SourceRange when an annotation
50 /// PtrData - This is a union of four different pointer types, which depends
51 /// on what type of token this is:
52 /// Identifiers, keywords, etc:
53 /// This is an IdentifierInfo*, which contains the uniqued identifier
55 /// Literals: isLiteral() returns true.
56 /// This is a pointer to the start of the token in a text buffer, which
57 /// may be dirty (have trigraphs / escaped newlines).
58 /// Annotations (resolved type names, C++ scopes, etc): isAnnotation().
59 /// This is a pointer to sema-specific data for the annotation token.
64 /// Kind - The actual flavor of token this is.
68 /// Flags - Bits we track about this token, members of the TokenFlags enum.
72 // Various flags set per token:
74 StartOfLine = 0x01, // At start of line or only after whitespace.
75 LeadingSpace = 0x02, // Whitespace exists before this token.
76 DisableExpand = 0x04, // This identifier may never be macro expanded.
77 NeedsCleaning = 0x08, // Contained an escaped newline or trigraph.
78 LeadingEmptyMacro = 0x10, // Empty macro exists before this token.
79 HasUDSuffix = 0x20 // This string or character literal has a ud-suffix.
82 tok::TokenKind getKind() const { return (tok::TokenKind)Kind; }
83 void setKind(tok::TokenKind K) { Kind = K; }
85 /// is/isNot - Predicates to check if this token is a specific kind, as in
86 /// "if (Tok.is(tok::l_brace)) {...}".
87 bool is(tok::TokenKind K) const { return Kind == (unsigned) K; }
88 bool isNot(tok::TokenKind K) const { return Kind != (unsigned) K; }
90 /// isAnyIdentifier - Return true if this is a raw identifier (when lexing
91 /// in raw mode) or a non-keyword identifier (when lexing in non-raw mode).
92 bool isAnyIdentifier() const {
93 return is(tok::identifier) || is(tok::raw_identifier);
96 /// isLiteral - Return true if this is a "literal", like a numeric
97 /// constant, string, etc.
98 bool isLiteral() const {
99 return is(tok::numeric_constant) || is(tok::char_constant) ||
100 is(tok::wide_char_constant) || is(tok::utf16_char_constant) ||
101 is(tok::utf32_char_constant) || is(tok::string_literal) ||
102 is(tok::wide_string_literal) || is(tok::utf8_string_literal) ||
103 is(tok::utf16_string_literal) || is(tok::utf32_string_literal) ||
104 is(tok::angle_string_literal);
107 bool isAnnotation() const {
108 #define ANNOTATION(NAME) \
109 if (is(tok::annot_##NAME)) \
111 #include "clang/Basic/TokenKinds.def"
115 /// getLocation - Return a source location identifier for the specified
116 /// offset in the current file.
117 SourceLocation getLocation() const { return Loc; }
118 unsigned getLength() const {
119 assert(!isAnnotation() && "Annotation tokens have no length field");
123 void setLocation(SourceLocation L) { Loc = L; }
124 void setLength(unsigned Len) {
125 assert(!isAnnotation() && "Annotation tokens have no length field");
129 SourceLocation getAnnotationEndLoc() const {
130 assert(isAnnotation() && "Used AnnotEndLocID on non-annotation token");
131 return SourceLocation::getFromRawEncoding(UintData);
133 void setAnnotationEndLoc(SourceLocation L) {
134 assert(isAnnotation() && "Used AnnotEndLocID on non-annotation token");
135 UintData = L.getRawEncoding();
138 SourceLocation getLastLoc() const {
139 return isAnnotation() ? getAnnotationEndLoc() : getLocation();
142 /// getAnnotationRange - SourceRange of the group of tokens that this
143 /// annotation token represents.
144 SourceRange getAnnotationRange() const {
145 return SourceRange(getLocation(), getAnnotationEndLoc());
147 void setAnnotationRange(SourceRange R) {
148 setLocation(R.getBegin());
149 setAnnotationEndLoc(R.getEnd());
152 const char *getName() const {
153 return tok::getTokenName( (tok::TokenKind) Kind);
156 /// startToken - Reset all flags to cleared.
163 Loc = SourceLocation();
166 IdentifierInfo *getIdentifierInfo() const {
167 assert(isNot(tok::raw_identifier) &&
168 "getIdentifierInfo() on a tok::raw_identifier token!");
169 assert(!isAnnotation() &&
170 "getIdentifierInfo() on an annotation token!");
171 if (isLiteral()) return 0;
172 return (IdentifierInfo*) PtrData;
174 void setIdentifierInfo(IdentifierInfo *II) {
175 PtrData = (void*) II;
178 /// getRawIdentifierData - For a raw identifier token (i.e., an identifier
179 /// lexed in raw mode), returns a pointer to the start of it in the text
180 /// buffer if known, null otherwise.
181 const char *getRawIdentifierData() const {
182 assert(is(tok::raw_identifier));
183 return reinterpret_cast<const char*>(PtrData);
185 void setRawIdentifierData(const char *Ptr) {
186 assert(is(tok::raw_identifier));
187 PtrData = const_cast<char*>(Ptr);
190 /// getLiteralData - For a literal token (numeric constant, string, etc), this
191 /// returns a pointer to the start of it in the text buffer if known, null
193 const char *getLiteralData() const {
194 assert(isLiteral() && "Cannot get literal data of non-literal");
195 return reinterpret_cast<const char*>(PtrData);
197 void setLiteralData(const char *Ptr) {
198 assert(isLiteral() && "Cannot set literal data of non-literal");
199 PtrData = const_cast<char*>(Ptr);
202 void *getAnnotationValue() const {
203 assert(isAnnotation() && "Used AnnotVal on non-annotation token");
206 void setAnnotationValue(void *val) {
207 assert(isAnnotation() && "Used AnnotVal on non-annotation token");
211 /// setFlag - Set the specified flag.
212 void setFlag(TokenFlags Flag) {
216 /// clearFlag - Unset the specified flag.
217 void clearFlag(TokenFlags Flag) {
221 /// getFlags - Return the internal represtation of the flags.
222 /// Only intended for low-level operations such as writing tokens to
224 unsigned getFlags() const {
228 /// setFlagValue - Set a flag to either true or false.
229 void setFlagValue(TokenFlags Flag, bool Val) {
236 /// isAtStartOfLine - Return true if this token is at the start of a line.
238 bool isAtStartOfLine() const { return (Flags & StartOfLine) ? true : false; }
240 /// hasLeadingSpace - Return true if this token has whitespace before it.
242 bool hasLeadingSpace() const { return (Flags & LeadingSpace) ? true : false; }
244 /// isExpandDisabled - Return true if this identifier token should never
245 /// be expanded in the future, due to C99 6.10.3.4p2.
246 bool isExpandDisabled() const {
247 return (Flags & DisableExpand) ? true : false;
250 /// isObjCAtKeyword - Return true if we have an ObjC keyword identifier.
251 bool isObjCAtKeyword(tok::ObjCKeywordKind objcKey) const;
253 /// getObjCKeywordID - Return the ObjC keyword kind.
254 tok::ObjCKeywordKind getObjCKeywordID() const;
256 /// needsCleaning - Return true if this token has trigraphs or escaped
259 bool needsCleaning() const { return (Flags & NeedsCleaning) ? true : false; }
261 /// \brief Return true if this token has an empty macro before it.
263 bool hasLeadingEmptyMacro() const {
264 return (Flags & LeadingEmptyMacro) ? true : false;
267 /// \brief Return true if this token is a string or character literal which
269 bool hasUDSuffix() const { return (Flags & HasUDSuffix) ? true : false; }
272 /// PPConditionalInfo - Information about the conditional stack (#if directives)
273 /// currently active.
274 struct PPConditionalInfo {
275 /// IfLoc - Location where the conditional started.
277 SourceLocation IfLoc;
279 /// WasSkipping - True if this was contained in a skipping directive, e.g.
280 /// in a "#if 0" block.
283 /// FoundNonSkip - True if we have emitted tokens already, and now we're in
284 /// an #else block or something. Only useful in Skipping blocks.
287 /// FoundElse - True if we've seen a #else in this block. If so,
288 /// #elif/#else directives are not allowed.
292 } // end namespace clang
296 struct isPodLike<clang::Token> { static const bool value = true; };
297 } // end namespace llvm